Support IETF RETRY from client

This CL parses the retry token, and updates our connection ID and crypters. Server-side support will come in a subsequent CL which will also add end to end tests.

gfe-relnote: Support IETF Retry packets from client in v99, protected by disabled v99 flag
PiperOrigin-RevId: 246911895
Change-Id: Icd5ecd22190fd18ad42882a66c3aa470640ce223
diff --git a/quic/core/quic_ietf_framer_test.cc b/quic/core/quic_ietf_framer_test.cc
index fa3aca4..f30fc99 100644
--- a/quic/core/quic_ietf_framer_test.cc
+++ b/quic/core/quic_ietf_framer_test.cc
@@ -96,6 +96,10 @@
   void OnVersionNegotiationPacket(
       const QuicVersionNegotiationPacket& packet) override {}
 
+  void OnRetryPacket(QuicConnectionId original_connection_id,
+                     QuicConnectionId new_connection_id,
+                     QuicStringPiece retry_token) override {}
+
   bool OnProtocolVersionMismatch(ParsedQuicVersion received_version,
                                  PacketHeaderFormat form) override {
     return true;